The Siemens 4EU4521-0AM00 is a 3-phase commutating choke for converter applications, rated 1300 A at 575 V AC with an inductance of 0.031 mH. This is a high-current line reactor sized for the DC link or AC input side of a large drive or rectifier — the 1300 A continuous rating places it in heavy industrial territory, typically feeding a multi-megawatt drive system or a large electrolysis / furnace supply. IP00 enclosure means it is an open-frame component intended for installation inside a ventilated cabinet or a dedicated converter cubicle — not for standalone floor mounting. The flat-type terminals accept busbar or heavy cable lugs, not DIN-rail terminal blocks.
The 1300 A rated current is the continuous thermal rating at 40 °C ambient. For a 575 V AC 3-phase system, that works out to roughly 1.15 MVA of throughput — so this choke is sized for a drive in the 800–1000 kW range, depending on the converter topology and overload profile. The DC-side rating is 1593.1 A, which matches the √2 × AC rating relationship typical for 6-pulse rectifier chokes. Power loss splits into 700 W in the coil and 404 W in the iron core. That heat must be ventilated out of the enclosure. Thermal class H per IEC 60085 means the insulation system is rated for 180 °C hot-spot temperature. That gives generous headroom above the 40 °C ambient — the choke can tolerate brief overloads or higher ambient without immediate failure, though continuous operation above 40 °C still requires derating per the manufacturer's curve.
Physical integration
Footprint is 0.46 m wide × 0.435 m tall × 0.293 m deep. That is a substantial component; plan for a dedicated mounting plate or chassis bracket. Operating frequency is 50/60 Hz. The choke is designed for line-frequency operation; do not use it on the output side of a PWM drive (carrier frequency) — the iron losses will spike and the inductance value will shift.